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Table 4 In vivo pharmacodynamic parameters of generic and innovator products of oxacillin by nonlinear regression from 4 independent experiments.

From: In vitro and in vivo comparison of the anti-staphylococcal efficacy of generic products and the innovator of oxacillin

OXACILLIN (OXA) PRODUCTS

Emax(log10CFU/g)

SEM

N

SEM

ED50(mg/kg)

SEM

BD (mg/kg)

SEM

1 LKD (mg/kg)

SEM

Adj. R2

Sy|x

P (CFA)

OXA-BMS (innovator)

5.42

0.08

1.73

0.13

45.19

2.32

62.24

3.07

108.36

7.32

0.99

0.23

NA

OXA-BLA

3.38

0.10

3.29

0.79

19.38

2.65

>750.00

-

>750.00

-

0.98

0.21

<0.0001

OXA-CAR

3.69

0.10

1.81

0.20

25.44

2.20

97.61

16.13

>750.00

-

0.99

0.17

<0.0001

OXA-COL

3.14

0.12

1.93

0.36

35.41

3.71

132.29

33.04

>750.00

-

0.98

0.20

<0.0001

OXA-MEM

3.51

0.12

2.09

0.32

23.07

2.65

>750.00

-

>750.00

-

0.96

0.32

<0.0001

OXA-OPH

3.11

0.15

NS

-

NS

-

>750.00

-

>750.00

-

0.96

0.31

<0.0001*

OXA-QIM

2.22

0.10

2.72

0.60

25.00

3.95

>750.00

-

>750.00

-

0.96

0.20

<0.0001

OXA-SCA

3.66

0.17

2.03

0.46

19.31

3.02

>750.00

-

>750.00

-

0.95

0.31

<0.0001

OXA-SER

-

-

-

-

-

-

-

-

-

-

-

-

NA

OXA-VIT

3.01

0.12

1.55

0.26

18.51

2.50

>750.00

-

>750.00

-

0.97

0.20

<0.0001

  1. Abbreviators: Emax: maximum effect; N: Hill's slope; ED50: effective dose to reach 50% of Emax; BD: bacteriostatic dose; 1LKD: 1 log kill dose; Adj. R2: adjusted coefficient of determination; Sy|x: standard error of the estimate; SEM: standard error of the mean; NA: not applicable; Bold numbers: not statistically different from zero, invalid parameter. * CFA comparison of Emax only. † Pharmacodynamic profile fits to Gaussian instead of Hill's model.